This recipes calls for chipotle sauce, which is a hot sauce made from chipotle peppers. These peppers have a warm, smoky flavor that is delicious in this dish. This recipe was tested using La Morena Homemade Style Chipotle Sauce, which can be found in the international aisle of your grocery store, Latin American markets, or online. If you cannot find this in your area, substitute an equal amount of smashed and finely chopped canned chipotles in adobo.